Top Definition
When a girl masturbates with a vault bottle
"Damn, that chick Lexi just pulled a Vault Girl
by Tankord December 26, 2008
Vault Girl is the female counterpart of Vault Boy, the Vault-Tec mascot. Unlike the Vault Boy, she only appears for female only perks or accompanies him in various images. The Vault Girl appears rarely contrary to the Vault Boy and only for some representation of perks, reputations, traits and equipment. She also appears in a TV for educating cyberdogs in Big MT. Playing as a female character will not cause the Vault Girl to appear, but downloading mods can help.
Vault Girl > Vault Boy
by picklestein June 23, 2016
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